Run-N-Iron Customizing provides a Color Case finish with a superior level of elegance
for the true firearm connoisseur. Color Case Hardening is a process for the surface
hardening of steel, which results in a decorative mottled-color finish.

To achieve these results, we use the traditional method of packing the component
into a steel crucible together with a generous amount of charred bone, wood and
leather, then heating the entire unit to a temperature of 1400 degrees F for two
hours or more. This process results in a marbleized red-yellow-blue color and gives
mild steel a very hard carbon-steel casing.

A risk with Color Case Hardening is the warping of components during exposure
to the extreme heat. To combat this potential problem, we fit receivers with precision
machine cut internal blocks to prevent the metal from being able to twist. Both
standard steel and gerfidic metals (post '64 Winchesters) can be color case hardened.